Range from the cheapest Downlights installation £342 (Absolute Electrical Services Ltd based in SO51) to the dearest Downlights installation £345 (B H M Electrical Services Ltd based in SO51).
Comparing electricians estimates for Downlights installation gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for installing downlights by posting a job to electricians in SO51.